Question

module Vehicle
  class Car < Wheeled
  end
end

module Vehicle
  class Bike < Wheeled
  end
end

What does this pattern of creating classes try to achieve is what I am not able to understand. What will be the disadvantage of doing this by including Vehicle as a module in the other classes?

Answer 1

Doing it this way keeps those classes namespaced under the Vehicle module:

Car.new
# => NameError: uninitialized constant Object::Car
Vehicle::Car.new
# => #<Vehicle::Car:0x0000123456>

This way, you could also have a separate Car class outside of the module, and the Vehicle::Car class will not interfere.